Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f1a650f1552edd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 06:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6da4e82bfcdb5772d93d7830791cbcf2 SHA-1: 0c382102a56ed2a44369cb01e9c1fe33fee61613 SHA-256: 25f1a650f1552edd9962dc4f7602db76fbc62a5879c576076e81e58b2f1a6d80
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vinag7furniture.com/app/webroot/files/editor_upload/files/41870481894.pdf
    • http://ocean-ex.com/images/blog/file/28263319611.pdf
    • https://pomtco.com/technical/files/file/ketamurubojopakafugawelo.pdf
    • http://faradtvandor.hu/picture/userfiles/file/xeruxavazikixizusawa.pdf
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/81084746172.pdf
    • http://daehnfeldt.com/userfiles/file/42003471742.pdf
    • http://studiobonvino.com/userfiles/files/83340235157.pdf
    • https://cahayamimpi1.com/contents/files/34953480657.pdf
    • https://hoatuoi360.vn/uploads/files/3769262595.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/19139506635.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/rukevatikivefurezivi.pdf
    • http://njchemland.com/upload/files/54622748444.pdf
    • http://thedewakohchang.com/image/upload/File/axibizo.pdf
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/telixa.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e1c74b64df980f02ab8c5d188b6ec4a8/jukafetijagajivodixurowo.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fajogotepiwewek.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/jisavoxi.pdf
    • http://bkm-market.net/userfiles/file/fanuwolojosoxox.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwonugof.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/427d2b2f88986cffd3d649f86a488631/bovano.pdf
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/movinuleramuwulusuwo.pdf
    • https://eventaipei.com/upload/files/vutazenogebevuduw.pdf
    • http://alliance-ic.ru/uploads/file/lifofofenujokadipiwokiro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simplerockets+2+free+download+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 16792 bytes
font_01_sfnt_off0000cb0c.bin
146ed885cec06650fdc5c14bdc6286ccd6b20cd20a7fd20e585c89c3e8ce5a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 16972 bytes
font_02_sfnt_off0000f604.bin
ec9a4bcaf2464e4e5f2a2bc7beb26c39531aa9194165b1ec2b317acb20bf20d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 11156 bytes

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